Last Baby Blues

So my husband and I have a 6 year old boy, a 3 year old girl, and are surprisingly pregnant with a little boy who is due in 2weeks and 5 days. I am so excited and almost ready to have this baby. But...my husband and I have decided it will be our last. I am completely in agreement with this, but at the same time don’t want to have the baby yet because then it will be over. I’ll never do this again. Has anyone else gone through this? Is the almost grief like feeling normal. You don’t want anymore kids, but the thought of never carrying another child is weighing a little different than you expected..? I really don’t want anymore kids it’s just something about the finality of it (coupled with the last few weeks of pregnancy) is just making my brain go crazy...Just thoughts...